mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-16 15:36:12 -04:00
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
// Copyright 2022 Google LLC
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// https://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#include "connections/implementation/mediums/ble_v2/ble_utils.h"
|
|
|
|
#include <string>
|
|
|
|
namespace location {
|
|
namespace nearby {
|
|
namespace connections {
|
|
namespace mediums {
|
|
namespace bleutils {
|
|
|
|
namespace {
|
|
|
|
// These two values make up the base UUID we use when advertising a slot.
|
|
// The base is an all zero Version-3 name-based UUID. To turn this into an
|
|
// advertisement slot UUID, we simply OR the least significant bits with the
|
|
// slot number.
|
|
//
|
|
// More info about the format can be found here:
|
|
// https://en.wikipedia.org/wiki/Universally_unique_identifier#Versions_3_and_5_(namespace_name-based)
|
|
constexpr std::int64_t kAdvertisementUuidMsb = 0x0000000000003000;
|
|
constexpr std::int64_t kAdvertisementUuidLsb = 0x8000000000000000;
|
|
|
|
} // namespace
|
|
|
|
const absl::string_view kCopresenceServiceUuid =
|
|
"0000FEF3-0000-1000-8000-00805F9B34FB";
|
|
|
|
ByteArray GenerateHash(const std::string& source, size_t size) {
|
|
return Utils::Sha256Hash(source, size);
|
|
}
|
|
|
|
ByteArray GenerateServiceIdHash(const std::string& service_id) {
|
|
return Utils::Sha256Hash(service_id, BlePacket::kServiceIdHashLength);
|
|
}
|
|
|
|
ByteArray GenerateDeviceToken() {
|
|
return Utils::Sha256Hash(std::to_string(Prng().NextUint32()),
|
|
mediums::BleAdvertisement::kDeviceTokenLength);
|
|
}
|
|
|
|
ByteArray GenerateAdvertisementHash(const ByteArray& advertisement_bytes) {
|
|
return Utils::Sha256Hash(
|
|
advertisement_bytes,
|
|
BleAdvertisementHeader::kAdvertisementHashByteLength);
|
|
}
|
|
|
|
std::string GenerateAdvertisementUuid(int slot) {
|
|
if (slot < 0) {
|
|
return {};
|
|
}
|
|
return std::string(Uuid(kAdvertisementUuidMsb, kAdvertisementUuidLsb | slot));
|
|
}
|
|
|
|
} // namespace bleutils
|
|
} // namespace mediums
|
|
} // namespace connections
|
|
} // namespace nearby
|
|
} // namespace location
|